Automatic overhead joist-boring machine



(No Model.)

I J. C. BONNETT.

` AUTOMATIC OVEEIIEAE IOIsT EOEING MACHINE.

I N0,5OO,471, PatentedJm. 4,1898.

TH: Nonms persas ou, pHoro-uma. wAsuwnvoN, o4 r.

NITED STATES v PATENT y Orricn.

JOHN C. BONNETT, OF BROOKVILLE, PENNSYLVANIA.

AUTOMATIC OVERHEADl `ICIST-BORING MACHINE.

SPECIFICATION forming part of Letters PatentNo. 596,471, dated January 4, 1898. Application iiled April l5, 1897. Serial No. 632,262. (No model.)

To all whom, it may concern.'

Beit known that I, JOHN C. BONNETT, a. citizen of the United States, residing at Brookville, in the county of Jefferson, State of Penn- Sylvania, have invented a new and useful Improvement in Automatic Overhead Joist- Boring Machines, which improvement is fully set forth in the following specification and accompanying drawings.

My invention consists of an improved construction of automatic overhead joist-boring machines, which is especially adapted for the use of electric Wiremen, provision being made for adjusting the machine to work upon any size of joist and at any distance from the iloor.

lt further consists of novel means for securing the machine to the joist, whereby the former is held in position during the boring of the latter.

It further consists of novel details of construction, all as will be hereinafter set forth, and fully pointed out in the claims.

Figure 1 represents a side elevation, partly in section, of an overhead joist-boring machine embodying my invention. Fig. 2 rep-` resents a detached view showing in section a portion of the supporting means for holding the machine in the desired position relative to the joist during the act of boring the latter. Fig. 3 represents a side elevation of an extension piece which may be employed. Fig. t represents a section on line :c at, Fig. l.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates a joist-boring machine, the same consisting of a suitable frame B, which has the bearings O D, in which the shaft or spindle E is rotatably mounted, the latter having the bevelgear F attached thereto and adapted to mesh with the bevel-gear G, which is mountedon the sleeve H, which revolves in suitable bearings in the portions J of the frame B.

K designates a shell which is splined to the sleeve H and has one extremity N made solid and provided with a socket or seat K', which is adapted to receive the head L of. the bit or auger lll, the spline being shown in dotted lines.

Q designates a rod which has a head P on the extremity thereof, said head being adapted `to seat in the solid portion N of the shell K and being held in position by the nut R, as will be understood from the right-hand portion of Fig. 1,,it being seen that the head P is thus swiveled in the solid portion N,which latter is therefore freely rotatable.

T designates a pin located in the extremity of the rod Q and adapted to engage the walls of the slot U, which is located at or near the extremity of the lever V, the latter being fulcrumed at XV to a suitable iixed point.

X designates links, each having one end pivotally attached to the lower portion ofthe lever V, while its other extremity is secured to a collar Y, which latter is loosely mounted on the neck or reduced portion Y of the sleeve Z, and is held in position by the fixed collar Y2.

Z designates a sleeve mounted on the lower extremity of the spindle E and` having the spiral keyway A therein, which is engaged by the pin or short feather A2, which normally rests in a recess B2, adjacent the upper extremity of the keyway proper.

B designates the head of the shank C', the

latter being brazed or otherwise secured to the lower vportion of the sleeve Z, its lower extremity being squared for the application of a bit-brace thereto, the same construction being employed Vas seen in the lower portion of Fig. 3, in which E2 designates an extension-tube, the same being provided with the notches or recesses F2 at its upper end, which are adapted to be engaged .by the pin C2 in practice.

The extension-pieces can be of any convenient length, so as to be readily transported, and enough of them can be joined together for any length of ceiling, the cords for operating the supporting or clamping device being of course lengthened, as well as being at-V tached to eyes in the handles T U.

E designates an arm projecting from the portion'D of the frame B and provided with a slot F therein, said slot having the thumbscrew G passing therethrough, said thumbscrew being adapted to engage a suitable portion of the base Hof the arm or abutment J', which is adapted to contact with a side of the joist K.

It will be evident that any desired adj ust- IOO ing device may be employed to hold the base Y H' in position, and as I do not desire to be limited to any specific construction any further description or illustration of the same is deemed to be unnecessary.

L' designates a spur or center attached to the sleeve h' ',which is internally threaded and mounted upon the externally-threaded stem or stud N', so as to be rotatable relative thereto, said stud being secured to any fixed point. as, in the present instance, the frame B.

P' designates a pulley or sheave mounted on the sleeve i and provided with the helical, spiral, or annular grooves Q', around which passes the cord or connection R', the other extremity of the latter being indicated by S', the ends of said cord having handles T' U', respectively, attached thereto.

- V' designates a casing surrounding the sleeve M' and its adj uncts, said casing having openings therein for the passage of the cords or connections R' S.

The machine is rst placed in position relative to the joist, as indicated in Fig. l, the abutment J' having been adjusted by the proper manipulation of the screw G'. The center or spur L' is next advanced and forced into the j oist by a pull being exerted on the proper cord or connection R', the machine being thus rmly held in position during the act of boring, and it will of course be evident that it can be readily and expeditiously adj usted, so as to perforate the joint at any desired point. The rotation of the bit or auger M is effected by rotating the shaft E, whereby the gears F G, sleeve A, and shell K are ro-' tated, it being noted that any upward pressure on the sleeve Z` will cause the loose collar Y to move upwardly, thereby moving the lever V, as indicated by the arrows at the right of Fig. l, whereby the bit or auger M will be caused to move to the left and enter the joist. The spiral keyway A' is preferably designed so as to make one-half a revolution in four inches of the sleeve movement, it being evident that when a rotary motion is applied to the sleeve Z the latter as it turns will allow the pin or feather A2 to enter the spiral keyway, at which period the feeding begins, the same being effected by said feather creeping down into the spiral as the sleeve Z rotates, it being apparent that the reversing of this rotation will cause the withdrawal of the bit and the feather will again ascend, or, in oth er words, the sleeve will descend, thus withdrawing the bit and restoring the feather again to the recess B2, as indicated in the drawings, when the machine will be ready to be shifted into a new position.

lt will be seen from the foregoing that the machine can be readily placed in position and has a readily-regulated positive feed of any desired speed. The machine vis dependent only upon the joist which is being operated for its support and can be used at any height from the floor or upon any size of joist, it being noted that the feeding is done by the forward motion, and the withdrawal of the bit or auger is effected by a reverse motion through the medium of the spiral keyway in the lower sleeve.

Having thus described my invention, what l claim as new, and desire to secure by Letters Patent, is- 4 l. ln an automatic overhead joistboring machine, a frame having mechanism connected therewith for securing it to a suitable support, a sleeve journaled in said frame, a shell splined to said sleeve and adapted to have attached thereto a tool, a rotatable spindle journaled in said frame and having a bevel-gear thereon meshing with a bevel-gear on the'sleeve, and mechanism connected with said spindle and said shell for advancing the latter.

2. An automatic overhead boring-machine having a frame, an abutment laterally adjustable on said frame, a threaded stud on said frame, a sleeve provided with threads engaging said stud, a grooved pulley connected with said sleeve and a rope passing around said pulley and provided with handles.

3.A In an overhead joist-boring machine, a frame, means connected therewith for securing it in a depending position to an overhead joist, a sleeve journaled in said frame, a shell splined to said sleeve, a spindle mounted in said frame, meshing bevel-gearing on said sleeve and spindle, a lever pivoted to said frame, a rod swiveled to said shell and pivotally connected with one end of said lever, a collar on said spindle, and a link connected with said collar and lever.

It. In an overhead joist-boring machine, a frame, a sleeve mounted therein, a shell splined to said sleeve and adapted to have a tool connected therewith, a lever pivoted to said frame, a rod having one end swiveled in said shell and the other provided with pins engaging in slots in said lever, a spindle having gearing meshing with gearing on said sleeve, a collar on said spindle having a spiral keyway engaged by a pin on said spindle, and a collar on a neck on said slotted collar having a link connection with said lever.

5. In an overhead joist-boring machine, a frame having the sleeve H mounted therein, the shell K splined to said sleeve and having the recess K' in a solid portion thereof, the lever V pivoted to said frame, the rod Q swiveled to said shell and pivotally connected with said lever, the spindle E' mounted in said frame and having gearing connected therewith meshing with gearing on said sleeve l-I,

the sleeve Z having the keyway A' engaged by the pin A2 on the said spindle E, the loose collar Y on the neck Y' of said sleeve Z, the fast collar Y2 .and the links X secured to said lever V and to said collar Y.

6. An automatic overhead joist-boring machine consisting of a frame, mechanism connected with said frame for securing it to an overhead j oist, a shell adapted to carry a boring-tool mounted in said frame, a spindle with connected sleeve, mechanism connected with IOO IOS

IIO

said sleeve and spindle for rotating the same in unison,and mechanism connected With said sleeve and shell for moving the latter in 1ongitndinal direction.

'7. An automatic overhead joist-boring machine having a frame with a tool-carrying de'- vice and a spindle mounted therein, mechanism connected with said device and spindle for rotating the same in unison, and mechanm ism connected With said tool-carrying device and spindle for moving said tool-carrying device longitudinally during the rotation of the same, said lattei` mechanism including an eX- tensible sleeve adapted to have connected therewith a bit.

JOHN C. BONNETT.

Witnesses:

JOHN MILLS, H. H. BRosIUs. 

